Twenty years in the business and I have seen two replies that tell you to just buy the replacement parts. One is a parts salesman and the other is a parts changer. The liability did not come from bad parts or bad seals but from incompetant parts changers.

I know it is beyond the scope of a lot of the folks out there, but hone the cylinder ,check the piston for pitting, replace the seals ,bleed the brakes and check the pedal.

I bought and installed many "remanufactured master cylinders" that did not work.

If you think you can do it ,do it . If you give up the parts man
will still be there to sell you a master cyl.

I think you can do it.